Trayvon's dad: I didn't deny it was son's voice

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Sondra Osterman, a friend of George Zimmerman, listens to the 911 tape while while on the witness stand at Seminole Circuit Court, in Sanford, Fla., Monday, July 8, 2013. Zimmerman is charged with second-degree murder in the fatal shooting of Trayvon Martin, an unarmed teen, in 2012. (AP Photo/Orlando Sentinel, Joe Burbank, Pool)